In skeletal muscle fibers, the sarcomere is the fundamental…
In skeletal muscle fibers, the sarcomere is the fundamental contractile unit. Each sarcomere is made up of thick and thin filaments. The thick filaments are primarily composed of myosin, while the thin filaments are made of actin. The thick filaments are centrally located and contribute to the formation of the H zone and are anchored at the M line in the center of the sarcomere. In contrast, thin filaments extend from the Z discs, which define the boundary of each sarcomere. According to the passage, which of the following statements about myosin myofilaments is NOT true?